Add ISA annotations to functions using SIMD, AES, etc

Also emit `#pragma GCC target` in the ISA specific amalgamation files.

This allows compiling without any special compiler flags, at least
with GCC 6.2 and Clang 3.8. The ISA annotations are ignored in MSVC,
which just emits whatever instruction the intrinsic requires.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/lib/rng/rdrand_rng/rdrand_rng.cpp b/src/lib/rng/rdrand_rng/rdrand_rng.cpp
index 4d2e51cf8..1ee857c6c 100644
--- a/src/lib/rng/rdrand_rng/rdrand_rng.cpp
+++ b/src/lib/rng/rdrand_rng/rdrand_rng.cpp
@@ -36,6 +36,7 @@ uint32_t RDRAND_RNG::rdrand()
    }
 
 //static
+BOTAN_FUNC_ISA("rdrnd")
 uint32_t RDRAND_RNG::rdrand_status(bool& ok)
    {
    ok = false;